Band-saw mill



(No Model.) 2 Sheets-Sheet 1.

T. S. WILKIN. BAND SAW MILL.

\ No. 432,682. Patented July 22,1890.

(No Model.)

2 Sheets-Sheet 2. T. S. WILKIN. BAND SAW MILL.

No. 432,682. Patented July 22, 1890.

UNlTEl) STATES ATENT rFIcE,

THEODORE S. \VILKIN, OF MILWVAUKEE, YVISCONSIN.

BAND-SAW MILL.

SPECIFICATION forming part of Letters Patent No. 432,682, dated July 22,1890.

Application filed March 1, 1890- Serial No. 342,247- (No model.)

To all whom it may concern.-

Be it known that I, THEODORE S. WILKIN,

' tion of my improved band-saw mill; Fig. 2, a

front face view of the same; Fig. 3, a vertical sectional view on theline 3 3 of Fig. 1; Fig. 4, a vertical sectional view on the line at 4,Fig. 1; and Fig. 5, a horizontal sectional view on the line 5 5 of Fig.3.

The main frame comprises a body portion A, between the upper and lowershafts B O, a comparatively narrow portion or neck D, which extendsoutwardly between the sawcarrying wheels E F, and an upright arm G,which extends from the lower shaft nearly to the upper shaft, as will beclearly seen upon reference to Figsl and 2. Behind the wheel E there isalso an upright post or standard H, which receives the upper saw-guidearm I and the pedestal J to which is pivotally secured one of the boxesor bearings K for the upper saw-wheel shaft, the opposite end of theshaft B being supported in a box or bearing K, carried by a pedestal J,which is designed to work through the upper end of the arm G.

Mounted upon the main portion of the frame A is a cylinder L, which isdesigned to receive a supply of steam, compressed air, or other motivepower, said cylinder being provided with an oscillating valve actuatedby means of a rod or pitman M, connected with an eccentric or crank Nupon the outer end of the lower shaft 0, as clearly shown in Fig. l. Theshaft 0 is also provided with three cranks O, P, and Q,the cranks O andQ being set diametrically opposite to the crank P, as will be readilyunderstood upon reference to Figs. 1, 3, and 4. The crank P is connectedby means of a rod or pitm an R with the piston-rod S of thesteam-cylinder, the upper face of the main frame being open at the pointof attachment of the cylinder to permit the piston-rod to work up anddown through the frame,as will be seen upon reference to Fig.

At suitable points on the inner faces of the side walls of the mainframe are formed upright ribs or flanges T, to which are bolted curvedor grooved plates or guides U, fash ioned to receive blocks V. One ofthe blocks V forms the connection between the pitman R and thepiston-rod S, while the remaining blocks V are secured to the upper endsof pitmen XV, secured, respectively, to the cranks O and Q. The plates Uare made adjustable toward and from each other by means of setscrews X,as clearly shown in Figs. 3, 4, and 5, and are guided in their movementsby means of slots Y and bolts Z, passing through said plates and flangesT.

The blocks V, to which I have before referred,and which are illustratedin Figs. 3, 4, and 5, are designed to act as counter-weights and toequalize or counteract the thrust of the piston-rod and cause the lowershaft 0 to rotate at a uniform rate of speed, the counter-weightsactuated by the pitmen W W alternating in their movement with thecounter-weight actuated by means of the pitaman B.

By placing the cylinder upon the main frame and connecting the pistondirectly with the shaft G, I obviate the use of belts, which are aconstant source of annoyance in saw-mills and necessarily result in awaste of power.

I am aware that it has been proposed to mount the circular saw ofaportable saw-mill upon the engine-shaft; that it has been proposed tomount an enginecylinder upon the main frame of a reciprocating-saw milland connect the sliding sash with the piston-rod; and, finally, that acounterbalance has been used in connection with a reciprocating sash. Tothese features, singly or combined, I make no claim herein.

In the use of band-saw mills which have heretofore been driven (Ibelieve exclusively) by belting, a difficulty has presented itself whichcannot arise either in a circular or a reciprocating saw mill, and thatis, that unless the speed of the saw carrying wheels be kept uniform,the down'going side of the band-saw will buckle immediately above thelog being sawed, and thereby cause a breakage of the saw and theendangering of the lives of the attendants. To obviate this difficulty,and to overcome other objections which have interfered heretofore withthe general use of band-saw mills, I have designed the mill hereindescribed and shown, and asI am the first, so far as I am aware, tomount the engine for driving the band-saw upon the main frame of themill, the first to connect the saw-carrying-wheel shaftdirectly to theengine, omitting intermediate connections, and, finally, the first toapplya counter-balance to abandsawmill, I claim these features andcombinations broadly.

Having thus described my invention, what I claim is 1. In a band-sawmill, the combination of the following elements, to wit: a main frame,upper and lower saw-carrying wheels mounted therein, and an enginemounted upon the main frame and having its piston-rod connected to thelower saw-wheel shaft, all substantially as shown.

2. In a band-saw mill, the combinationof the following elements, to wit:a main frame, upper and lower saw-carrying wheels mounted therein,anengine mounted upon the main frame and having its piston-rod connectedto the lower shaft, and a counter-weight, all com bined and arrangedsubstantially as shown and described.

3. In a band-saw mill, the combination, with the main frame and theupper and lower saw-carrying wheels and their shafts, of the cranks O,Q, and P, pitmen 'W W, connected with the cranks O Q and provided attheir upper ends each with a counter-weight, a steamoylinder L, a pistonworking therein and provided with a stem S, a block V, secured to saidstem, and a pitman It, connecting the block with the crank R, allsubstantially as shown.

In witness whereof I hereunto set my hand in the presence of twowitnesses.

THEODORE S. WVILKIN. Witnesses:

JOHN W. Mounts, A. H. SOUTHWELL.

